| Year | Value | | 2022 | 363.25481348449 | | 2021 | 318.93648130827 | | 2020 | 303.13107718171 | | 2019 | 288.57277437626 | | 2018 | 264.37505538256 | | 2017 | 231.0941154279 | | 2016 | 178.44194847944 | | 2015 | 156.78437263698 | | 2014 | 142.05280066167 | | 2013 | 129.05653001288 | | 2012 | 117.89244572482 | | 2011 | 110.06492598748 | | 2010 | 100 | | 2009 | 89.875370328358 | | 2008 | 80.415675955391 | | 2007 | 67.966387209159 | | 2006 | 62.172546809423 | | 2005 | 57.75727653095 | | 2004 | 55.075434970011 | | 2003 | 49.496835104023 | | 2002 | 47.361868012585 | | 2001 | 46.100001013297 | | 2000 | 45.076865608469 | | 1999 | 43.898709687758 | | 1998 | 42.587236123387 | | 1997 | 40.999499562841 | | 1996 | 39.186869460822 | | 1995 | 36.559313675947 | | 1994 | 31.58684044478 | | 1993 | 29.205367251227 | | 1992 | 26.055331761589 | | 1991 | 22.928477965336 | | 1990 | 19.147187132742 | | 1989 | 16.399264862982 | | 1988 | 13.523843279601 | | 1987 | 11.493661901196 | | 1986 | 9.6025706831029 | | 1985 | 7.7524932302302 | | 1984 | 6.9152774575809 | | 1983 | 5.9086570024998 | | 1982 | 5.0901649052771 | | 1981 | 4.4330530581604 | | 1980 | 4.0184573879986 | | 1979 | 3.3260082493049 | | 1978 | 3.0262750575145 | | 1977 | 2.7244569785496 | | 1976 | 2.4167521593217 | | 1975 | 2.1907258612557 | | 1974 | 1.9975671963318 | | 1973 | 1.8155688098342 | | 1972 | 1.7272677058628 | | 1971 | 1.6917019834377 | | 1970 | 1.6401930061229 | | 1969 | 1.5807124013681 | | 1968 | 1.5285902219448 | | 1967 | 1.5546422865805 | | 1966 | 1.543806348656 | | 1965 | 1.4158627513308 | | 1964 | 1.2329110287646 | | 1963 | 1.1893684525188 | | 1962 | 1.1805538975108 | | 1961 | 1.2171044771134 | | 1960 | 1.20872070863 |
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